{"product_id":"5-inch-gauge-a3-doncaster-stock-code-2478","title":"5 inch gauge A3 \"Doncaster\"","description":"\u003cp\u003eA finely-built example of an LNER A3 to Don Young's \"Doncaster\"  design. A rare model, unsurprising given that Don Young was ex-Doncaster Works  drawing office and didn't short-change builders on the amount of detail they  were getting.    \u003c\/p\u003e\u003cp\u003eSilver-soldered copper boiler with combustion chamber and superheaters, fed  by twin injectors with auxiliary hand pump in tender. Three cylinders with  piston valves, the outside pair actuated by Walschaert's valve gear, the middle  one by the ingenious derived motion supplied by Gresley-Holcroft conjugated  gear. Mechanical lubricator (with additional dummy Wakefield lubricators on  running board), drain cocks cable operated from cab.    \u003c\/p\u003e\u003cp\u003eThe engine runs well, the valve gear is accurately set and produces a lovely  even torrent of beats from the three cylinders, even at modest(-ish!) speeds. As  with the only other A3 I've owned (again a Don Young one, that time  \"Solario\"), there is a large amount of power available with very  little fuss, the boiler steams particularly freely.    \u003c\/p\u003e\u003cp\u003eThe engine comes with a large amount of documentation, builder's notes and a  complete set of drawings. There is a purpose-built stand which also doubles as a  rolling road for test running, the whole thing is mounted on castors for ease of  moving.    \u003c\/p\u003e\u003cp\u003eLength\u003cbr\u003e  Locomotive 47 inches\u003cbr\u003e  Tender 28 inches\u003cbr\u003e  Weight approx 250 pounds    \u003c\/p\u003e\u003cp align=\"center\"\u003e\u003c\/p\u003e","brand":"Station Road Steam","offers":[{"title":"Default Title","offer_id":54019993895253,"sku":"2478","price":10000.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1023\/0094\/2677\/files\/2478-1.webp?v=1779909216","url":"https:\/\/stationroadsteam.com\/products\/5-inch-gauge-a3-doncaster-stock-code-2478","provider":"Station Road Steam","version":"1.0","type":"link"}